The Golden Gate Bridge turned 75 years old this year. I was in the Bay Area during the diamond jubilee, and though I wasn’t able to attend any official event, I did cross the span twice. It’s a marvel. Jon Christensen interviewed John King, the San Francisco Chronicle’s urban design critic, and Anthea Hartig, the California Historical Society’s executive director, on the bridge’s historical and cultural importance a few months back, just before the celebration.